Adjustable Pedals: Removal & Installation Chevrolet Suburban X

Removal Procedure

1. Remove the master cylinder from the brake booster. DO NOT disconnect the hydraulic brake pipes from the master cylinder. Refer to Master Cylinder Replacement (Vacuum Boost) or Master Cylinder Replacement (Hydraulic Boost) in Hydraulic Brakes.
2. Disconnect the brake assist pump motor wiring harness and vacuum hose (if equipped).
3. Remove the steering column from the vehicle. Refer to STEERING COLUMN REPLACEMENT in Steering Wheel and Column.
4. Remove the transmission range selector cable support bolt from the I/P reinforcement brace.
5. Remove the upper nut from the Instrument Panel (I/P) reinforcement brace at the I/P. NOTE: Avoid damaging the surrounding components while cutting.
6. Cut off the I/P reinforcement brace studs close to the I/P carrier.
7. Remove the lower I/P reinforcement brace bolt (1) from the electronic adjustable pedal (EAP) bracket.
8. Remove the I/P reinforcement brace.
9. Disconnect the electrical connectors from the following components: The adjustable pedals motor assembly The memory sensor connector (if equipped) The pedal position sensor The accelerator wiring harness connector
10. Remove the pushrod retaining clip (3) from the brake pedal pin (1).
11. Remove the brake pedal pushrod (2) and the stop lamp switch (4) from the brake pedal.
12. Remove the EAP bracket nuts (2) from the studs (3) at the bulkhead.
13. Remove the top EAP bracket bolt (1).
14. Move the brake booster forward until the studs are removed from the mounting holes.
15. Remove the EAP assembly from the vehicle.
16. Remove the cable retaining clip on the top of the bracket.
17. Adjust the accelerator pedal to the fully forward position using the following procedure. Remove the screws from cable housing at the top of the adjustable pedal motor. Twist the cable housing to unlock the cable from the motor. Remove the cable from the adjustable pedal motor. Attach a drill motor or equivalent to the adjustable pedal cable. Spin the cable until there is a distance of 21.4 mm from the accelerator transmission assembly cap to the small outer diameter of the adjuster pin.
18. Remove the adjustable pedal cable from the accelerator pedal: Twist the cable housing to unlock the cable from the accelerator pedal. Compress the secondary locking tabs located below the housing locking tabs and pull the cable from the accelerator pedal assembly. Important: Note the position of the brake pedal return spring (1).
19. Remove the nut from the brake pedal pivot bolt.
20. Remove the brake pedal pivot bolt.
21. Remove the brake pedal and return spring assembly from the bracket.

Installation Procedure

1. Install the brake pedal and return spring assembly to the bracket.
2. Install the brake pedal pivot bolt. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
3. Install the nut to the brake pedal pivot bolt. Tighten Tighten the nut to 30 N.m (22 lb ft).
4. Hook the return spring (1) to the backside of the brake pedal assembly (2). Important: The adjustable pedals cable assembly must be installed in its original position and fastened with cable retaining clip to the top of the bracket. Make sure the cable is not twisted or binding.
5. Install the adjustable pedal cable to the accelerator pedal: Insert the adjustable cable into the accelerator pedal assembly until it is secured by the secondary locking tabs. Install and twist the cable housing to secure to the accelerator pedal assembly.
6. Install the cable retaining clip to the top of the bracket.
7. Install the EAP assembly to the vehicle.
8. Install the brake booster to its mounting position.
9. Install the top EAP bracket bolt (1). Tighten Tighten the nuts to 25 N.m (18 lb ft).
10. Install the EAP bracket nuts (2) to the studs (3) at the bulkhead. Tighten Tighten the nuts to 25 N.m (18 lb ft).
11. Install the brake pedal pushrod (2) and the stop lamp switch (4) to the brake pedal.
12. Install the pushrod retaining clip (3) to the brake pedal pin (1).
13. Connect the electrical connectors to the following components: The adjustable pedals motor assembly The memory sensor connector (if equipped) The pedal position sensor The accelerator wiring harness connector
14. Position the replacement I/P reinforcement brace and install the upper and lower bolts to maintain the position of the brace The lower bolt may be removed after the brace is in position. Important: Do not allow the assembly tool speed to exceed 350 rpm on fasteners with an adhesive patch.
15. Install the upper I/P reinforcement brace nut to the bolt. Tighten Tighten the nut to 22 N.m (16 lb ft).
16. Install the lower I/P reinforcement brace bolt (1) to the EAP bracket. Tighten Tighten the bolt to 25 N.m (18 lb ft).
17. Install the transmission range selector cable support bolt to the I/P reinforcement brace. Tighten Tighten the bolt to 10 N.m (89 lb in).
18. Install the steering column to the vehicle. Refer to STEERING COLUMN REPLACEMENT in Steering Wheel and Column. Install the lower I/P reinforcement brace bolt (2) after the column is in position.
19. Connect the brake assist pump motor wiring harness and vacuum hose (if equipped).
20. Install the master cylinder to the brake booster. Refer to or Master Cylinder Replacement (Hydraulic Boost) in Hydraulic Brakes.
21. Verify the operation of the adjustable pedals.

Important: Ensure that the brake pedal assembly is adjusted to its lowest position farthest from the drivers seat prior to removal of the accelerator assembly. Failure to do so could result in incorrect step-over height between the brake and accelerator pedals and improper function of the adjustable pedal system.

1. Disconnect the adjustable pedals motor electrical connector.
2. Remove the locking clip and disconnect the accelerator sensor connector.
3. Remove the adjustable pedals cable from the accelerator pedal assembly using the following procedure: 3.1. Twist the cable housing counterclockwise. 3.2. Using needle nose pliers or an equivalent, compress the secondary locking tabs located below the twist and lock tabs and remove the cable from the accelerator assembly.
4. Remove the accelerator mounting nuts from the accelerator bracket.
5. Remove the accelerator assembly from the vehicle.

1. Install the accelerator assembly to the vehicle. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the accelerator mounting nuts to the accelerator bracket. Tighten Tighten the nuts to 9 N.m (80 Lb in).
3. Install adjuster drive cable into accelerator assembly.
4. Twist the cable housing and confirm the cable is secure.
5. Connect the accelerator sensor connector and install the locking clip.
6. Connect the adjustable pedals motor electrical connector.
7. Verify the operation of the adjustable pedals.
8. Confirm that the accelerator sensor connector locking clip is installed properly.
9. Verify the operation of the accelerator pedal.

1. Disconnect the brake pedal position sensor electrical connector.
2. Remove the brake pedal position sensor bolt.
3. Remove the brake pedal position sensor from the vehicle.

1. Install the brake pedal position sensor to the vehicle. NOTE: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.
2. Install the brake pedal position sensor bolt. Tighten Tighten the bolt to 9 N.m (80 Lb in).
3. Connect the brake pedal position sensor electrical connector.

The adjustable pedals system consists of the following components

1. The adjustable pedals position switch
2. The driver door module
3. The driver seat module
4. The adjustable pedals relay
5. The adjustable pedals motor
6. The brake pedal position sensor

The adjustable pedal system is controlled by the driver door module and the driver seat module and operation can occur only while the transmission selector lever is in the park position. The adjustable pedals assembly is moved forward or backward by a motor which is fixed to the brake pedal actuator with a drive cable to the accelerator pedal actuator. The adjuster motor is controlled by the driver door module through the adjustable pedals relay. The adjustable pedals relay supplies battery voltage and ground to the adjuster motor using two sets of relay coils and switch contacts. In an inactive state both of the relay switch contacts are closed to ground. The driver door module controls the adjuster motor by energizing one of the relay coils, closing the appropriate motor control circuit to the battery voltage supply contact. The adjuster motor is bidirectional and the direction of the pedal assembly travel is determined by which of the motor control circuits is switched to battery positive voltage while the other remains grounded.

The adjustable pedals forward and rearward switches are inputs to the driver door module. The driver door module supplies the switch assembly with a battery positive reference voltage. When the switch is operated to the forward or rearward direction the forward or rearward switch signal circuit is closed to the reference voltage. In an active state the forward or rearward switch signal circuit voltage is supplied to the driver door module through one of the 806 ohm resistors within the switch assembly. The resistors in the switch assembly enables the driver door module to recognize an invalid switch signal.

The adjustable pedals system is capable of operating in conjunction with the memory seat system. The driver seat module monitors the location of the adjustable pedals using the brake pedal position sensor. The brake pedal position sensor is supplied with 5-volt reference and ground circuits from the driver seat module. The position sensor signal circuit is referenced from ground within the driver seat module. The signal voltage monitored by the driver seat module ranges from 0.39 - 4.58 volts and is determined by the wiper location on the resistor within the position sensor. The position sensor signal circuit voltage level is used by the driver seat module to determine the position of the adjustable pedals when storing or recalling memory position settings. The memory 1 and 2 switches are an inputs to the driver door module and when a memory recall function is activated, the driver door module and driver seat module relay information through the Class 2 Serial Data circuit in order to operate the adjustable pedals assembly in the appropriate direction until the stored memory position is reached.